It is certainly much easier for people like me who get a strong indication from the MDT about which treatment to have.
Prior to my diagnosis meeting, though I had loads of tests, I was assuming it probably wasn't serious. At the meeting with G9, with 95%-100% involvement all cores , extra capsular extension and perineural involvement. It was clear that I wasn't a candidate for active surveillance. My next assumption was that surgery would be required, but the urologist, looked aghast. I'm pretty sure he was more concerned about his statistics, than me as a patient, but maybe I'm too cynical.
Anyway the only treatment recommended for me was HDR brachy, EBRT, HT. So that is what I had, if I had been given a choice I would have probably chosen surgery, but that would have been from a position of inadequate knowledge, because you only know what is right long after the treatment.
If the MDT are giving strong advice for a treatment it is almost certainly the best choice. If they are equivocal on treatment, you may as well toss a coin.